---
title: "Modifying Subnets"
canonical: "https://docs.infoblox.com/space/BloxOneDDI/186467355/Modifying%20Subnets"
format: markdown
---
<span style="color: #000000">When you modify a subnet, you can view the leases, DHCP options, and filters that are inherited from the Global DHCP Configuration. You can override these values. For more information, see </span><u><span style="color: #1155cc">*[Global DHCP Configuration](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/186400924)*</span></u><span style="color: #000000">.</span>

<span style="color: #000000">To modify a subnet, complete the following:</span>

1. <span style="color: #000000">From the Infoblox Portal, click </span><span style="color: #000000">**Network > IPAM > Address Spaces**</span><span style="color: #000000">. The list of IP spaces is displayed.</span>
2. <span style="color: #000000">Click the respective </span><span style="color: #000000">**IP Space**</span><span style="color: #000000"> > </span><span style="color: #000000">**Address Block **</span><span style="color: #000000">to view the list of subnets that are associated with it.</span>
3. <span style="color: #000000">Click </span>☰<span style="color: #000000">> </span><span style="color: #000000">**Edit**</span><span style="color: #000000"> or select the respective subnet and click the </span><span style="color: #000000">**Edit**</span><span style="color: #000000"> button to modify a subnet.</span>
4. <span style="color: #000000">Modify the details for the following fields as required:</span>
  - **Name**: Enter a name for the IP space.
  - **Description**: Enter additional information about the IP space.
  - **Access View**: Select the Access View from the drop-down. For more information, see *[Configuring Access Views](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneCloud/pages/680362523)*.
  - **Federated Realms**: Choose the Federated Realm and move it from **Available** to **Selected** by clicking **>>**. Default Realms will be used for any new Address Blocks or Subnets created. For more information, see <u>*[Federated Realms](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/684884590)*</u>.
  - **Tags**: For information about tags, see <u>*[Managing Tags](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneCloud/pages/35397076)*</u>.
  - Configure the following components of DHCP Configuration:
    - **Automated Scope Management**: The values are inherited from the Global DHCP Configuration. You can override and specify a different value. For more information, see <u>*[Configuring Automated Scope Management](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/186876614)*</u>.
    - **Leases**: The values are inherited from the Global DHCP Configuration. You can override and specify a different value. For more information, see <u>*[Defining Lease Times](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/186778823)*</u>.
    - **DHCP Options**: The values are inherited from the Global DHCP Configuration by default. For more information on configuring DHCP options in Global DHCP Configuration, see <u>*[Configuring DHCP Options](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/186714220)*</u>. You can configure the inheritance for each item granularly. For more information, see <u>*[Granular Inheritance of DHCP Options](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/186909220)*</u>.
    - **DDNS**: DDNS updates go to Universal DDI-managed zones or zones hosted by an external DNS server. For example, you can configure NIOS as the external primary server. The **Default DDNS Domain Name** is inherited from the Global DHCP Properties. See <u>*[Enabling DDNS for IPv4 Clients](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/186714183)*</u>. You can override the settings and specify a different value for the **Default DDNS Domain Name**.
    - **Filters**: The values are inherited from the Global DHCP Configuration. You can override and specify a different value. For more information, see <u>*[Configuring DHCP Filters](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/186369598)*</u>.
    - **Advanced Configuration**: Configure advanced settings like Abandoned Reclaim Time. See <u>*[Advanced Configuration](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneDDI/pages/220104221)*</u>.
5. <span style="color: #000000">Click </span><span style="color: #000000">**Save & Close**</span><span style="color: #000000">.</span>